Age Calculator

When to use this calculator

An exact age comes up more often than you would think, and a rough estimate rarely cuts it. Reach for this tool when you need a precise figure for a form, a verification check, or an eligibility question — confirming a teenager has turned 16 for a driver's permit, checking someone is 21 before a purchase, or working out exactly how many days old an infant is for a pediatric visit. Because it returns years, months, and days at once, it answers questions a single age number cannot.

It is equally good for the fun stuff: finding which day of the week you were born, settling who is older by how many days, or counting down to a landmark birthday. Enter the date in MM/DD/YYYY order the way you would write it anywhere in the US, and the calculator handles the calendar math — every leap year included — so you do not have to.

Reading your result

The main figure is your age in completed years, months, and days. Read it as an exact interval rather than a rounded one: '34 years, 5 months, and 2 days' means you are past your 34th birthday and counting. The years figure follows the usual convention of rounding down — you are 34 from your 34th birthday until the day before you turn 35.

You also get your total days alive, the weekday you were born on, and the time left until your next birthday. The days-alive count goes up by one every day; only the years figure jumps, and it does so on your birthday. If the number ever seems to skip, it is the years rolling over that you noticed, not a gap in the daily count.

A worked example

Say your date of birth is 01/15/1990 and today is 06/08/2026. The calculator returns 36 years, 4 months, and 24 days: a full 36 years to 01/15/2026, then four whole months to 05/15/2026, then the remaining days to today. Your total days alive would be just over 13,200, and January 15, 1990 was a Monday. Your next birthday, 01/15/2027, is about seven months out — handy if you are planning a milestone party or lining up a gift.

Mistakes to watch for

Most age-calculation errors trace back to the date entry or to misreading what the number actually means.

• Entering the date in DD/MM order out of habit — in the US the month comes first, so 04/03/1990 is April 3, not March 4.
• Expecting age in months to equal years times twelve; calendar months differ in length, so the breakdown will not split evenly.
• Forgetting that the years figure rounds down — you are not '35' until the actual day you turn 35, no matter how near.
• Assuming a February 29 birthday advances on March 1; states differ on the legal rule, and this tool shows February 28 in non-leap years.

US legal-age and retirement notes

In the US, key thresholds spread across several ages and some vary by state. Eighteen is the federal voting age and the age of majority for most contracts, but the drinking age is 21 nationwide, and driving permits and full licenses start earlier and differ state to state. This calculator only tells you your exact age — it applies none of these rules — but the precise day count is exactly what matters when a birthday lands right against a deadline.

For retirement, several federal milestones tie to age: 59½ for penalty-free IRA withdrawals, 62 for early Social Security, 65 for Medicare, and 67 for full Social Security retirement age if you were born in 1960 or later. Use your exact age here as the starting point, then check SSA.gov for the eligibility schedule that matches your birth year, since the full retirement age shifts with the year you were born.